A kind of preparation method of slit formation Carbonate Reservoir perforationTechnical field
The present invention relates to a kind of preparation method of oil reservoir perforation, and in particular to a kind of slit formation Carbonate Reservoir perforationPreparation method.
Background technology
Perforation is the important step of oil-gas field development, is to understand an oil-gas reservoir very crucial step.In perforating design, adoptWith the perforating scheme of optimization, oil-gas Layer can be farthest opened, productivity of hydrocarbon is discharged to greatest extent, so as to reach increasingProduce the purpose of augmented injection.
By the development of more than ten years, a series of perforating technologies and its supporting gun perforation process are successively formd, is on the one hand improvedPerforation completion and storey increase design effect and operating efficiency；On the other hand by Reasonable Protection reservoir, extend oil-gas reservoir and openSend out the life-span.
With enriching constantly for domestic and international Reservoir Development type, oil-gas field development difficulty constantly increases, to perforating technologyDevelopment propose higher requirement.In protection reservoir, production capacity and operating efficiency are improved, improves unconventionaloil pool field exploitation effectReally, recover old oil- and gas-field production capacity, extension exploitation of oil-gas field life-span, play more and more important in terms of maximization Remaining OilEffect.
Generally, for conventional oil gas reservoir, to prevent water cone, it is to avoid the too early water logging of oil well, in oil-water interfacesCertain absolute thickness not perforation should be retained above.And in slit formation Carbonate Reservoir, retain on oil-water interfacesEnough absolute thickness not perforation, but due to the vertical communication in crack, the absolute thickness retained effectively can not prevent groundThe lifting of layer water, so that the too early water logging of oil well, seriously governs the increase of slit formation carbonate rock oil field oil production and aqueousThe reduction of rate.
The content of the invention
It is an object of the invention to provide a kind of preparation method of slit formation Carbonate Reservoir perforation, the present invention is to greatest extentGround discharges reservoir productivity and reduces its moisture content, and avoids the too early water logging of oil well, so as to reach the purpose of volume increase.
The preparation method for the slit formation Carbonate Reservoir perforation that the present invention is provided, it comprises the following steps：
1) core sample based on formation fracture type Carbonate Reservoir, to the rock core pillar and rock core of the core sampleCrack is developed in thin slice and carries out comprehensive analysis, the type and feature in the development crack is drawn；
2) electric imaging logging data is gathered in the interval of interest of the slit formation Carbonate Reservoir；Based on the Electrical imagingWell-log information, analytical procedure 1) described in development crack the response in the electric imaging logging data of type and feature it is specialLevy, and set up the development characteristics of the type and feature in the development crack in the electric imaging logging data；
3) different configuration position core analyzing data based on the slit formation Carbonate Reservoir and the electricity of producing wellImage Logging Data, with reference to the development crack distribution characteristics and the electric imaging logging data on crack development models,Development degree of the development crack at the slit formation Carbonate Reservoir different configuration position is obtained, the development is obtained and splitsIt is sewn on the regularity of distribution in the slit formation Carbonate Reservoir plane；
4) regularity of distribution based on the development crack in slit formation Carbonate Reservoir plane, analysis is located at described splitThe anhydrous period of the fracture developing zone of seam type Carbonate Reservoir producing well is tired to recover the oil, anhydrous period number of days and keep away between the ratio of penetratingRelation, show that the time that producing well anhydrous period in the fracture developing zone recovers the oil is most long, and anhydrous period is tired when recovering the oil mostOptimal keep away the ratio of penetrating；Wherein, the ratio of penetrating of keeping away refers to distance and stratum between perforation bottom circle and Water Flooding Layer or water layer top circlePush up the ratio of distance between boundary and Water Flooding Layer or water layer top circle；
5) collection natural gamma, natural potential, calliper log curve, it is deep, in, shallow resistivity log, bulk density,Neutron porosity, compressional wave time difference log, and the electric imaging logging data are pointed to the stepout well of the fracture developing zoneWell Data Processing is carried out with explaining, and the evaluation rubric and standard of the Water Flooding Layer based on slit formation Carbonate Reservoir, obtainThe particular location that oil reservoir, Water Flooding Layer and the water layer of the stepout well are distributed in full well section；
6) it is distributed according to optimal oil reservoir, Water Flooding Layer and the water layer for keeping away the ratio of penetrating and the stepout well in full well sectionParticular location, the stepout well is made slit formation Carbonate Reservoir using most preferably keep away the ratio of penetrating carries out perforation production to itPerforation.
Step 2 of the present invention) in, " analytical procedure 1) described in development crack type and feature in the electric imaging loggingResponse characteristic in data, and it is special to set up the development of the type and feature in the development crack in the electric imaging logging dataLevy " in analysis specific method using method well known in the art progress.
In above-mentioned preparation method, the type in the development crack includes high angle frature, oblique seam, attractive joint, filling-halfAt least one of filling seam and the netted seam of oblique.
In above-mentioned preparation method, the feature in the development crack includes density, width and longitudinal extent.
In above-mentioned preparation method, natural gamma, natural potential, calliper log curve are gathered using logger, deeply,In, shallow resistivity log, bulk density, neutron porosity, compressional wave time difference log, and the electric imaging logging moneyMaterial.
Step 5 of the present invention) in, processing and explanation to well-log information are also that method conventional in the art is carried out；
The evaluation rubric and standard of the Water Flooding Layer of the slit formation Carbonate Reservoir are commented using this area Water Flooding LayerThe conventional method of valency is evaluated.
The present invention has advantages below：
1st, the preparation method of slit formation Carbonate Reservoir perforation of the present invention, by setting up fracture developing zone Carbonate OilThat hides keeps away the ratio of penetrating, and reservoir productivity can be discharged to greatest extent, and avoid the too early water logging of oil well.
2nd, the invention provides a kind of highly versatile, the effective ways of good economy performance, the present invention can be widely applied to splitIn the perforating scheme of seam type Carbonate Reservoir.
Brief description of the drawings
Fig. 1 is the crack pattern of carbonate rock rock core pillar；
Fig. 2 is the crack pattern under carbonate rock rock core mirror；
Fig. 3 is crack pattern of the L wells partly shown by interval carbonate rock electric imaging logging data；
Fig. 4 is the flat distribution map of certain slit formation carbonate rock oil field fracture developing zone；
Fig. 5 is that slit formation Carbonate Reservoir is kept away and penetrates ratio schematic diagram；
Fig. 6 is the tired oil recovery of certain slit formation carbonate rock oil field anhydrous period, anhydrous period number of days and the relation kept away between the ratio of penetrating；
Fig. 7 is carbonate rock watered out layers evaluation flow；
Fig. 8 is certain slit formation carbonate rock oil field N well partly interval Well Data Processing and interpretation results figure；
Fig. 9 is certain slit formation carbonate rock oil field P well partly interval Well Data Processing and interpretation results figure.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material, reagent used etc., unless otherwise specified, are commercially obtained in following embodiments.
The inventive method is described further below by specific embodiment.
Embodiment 1,
By taking certain slit formation Carbonate Reservoir M as an example, the preparation method of slit formation Carbonate Reservoir perforation is specifically includedFollowing steps：
1) core sample based on slit formation Carbonate Reservoir M under a certain depth in stratum is thin to rock core pillar and rock coreThe crack developed in piece carries out comprehensive analysis, draws the type mainly high angle frature in developed crack, the density master in crackIt is distributed between 2~5, the width about 0.02mm in crack, crack longitudinal extent about 1~2m, as depicted in figs. 1 and 2.
2) interval of interest using logger in slit formation Carbonate Reservoir M gathers electric imaging logging data；Based on LThe electric imaging logging data that well is gathered, analytical procedure 1) in the type, close in crack is developed on rock core pillar and core waferDegree, the response characteristic of width and longitudinal extent in electric imaging logging data, wherein difference deeply, between shallow resistivity refers toShow the presence in crack, and electric imaging logging data shows that the type in crack is mainly high angle fracture, local development 2~5Crack, crack longitudinal extent about 1~2m, as shown in Figure 3.
3) based on slit formation Carbonate Reservoir M different configurations position core analyzing data and, the Electrical imaging of producing well is surveyedWell data, with reference to the development characteristics in crack in fractue spacing feature on rock core pillar and core wafer and electric imaging logging data,Development degree of the crack at slit formation Carbonate Reservoir M different configurations position is specified, crack is summarized in slit formation carbonate rockWhite portion is slit formation Carbonate Reservoir M fracture developing zone in the regularity of distribution in oil reservoir M planes, Fig. 4.
4) analysis is located at slit formation Carbonate Reservoir M the fracture developing zones tired oil recovery of anhydrous period of producing well, anhydrous periodNumber of days and the relation kept away between the ratio of penetrating, wherein keep away the ratio of penetrating refer between perforation bottom circle and Water Flooding Layer or water layer top circle distance andPush up the ratio (as shown in Figure 5) of distance between boundary and Water Flooding Layer or water layer top circle in stratum；Fig. 6 is slit formation Carbonate Reservoir MFracture developing zone has produced the tired oil recovery of anhydrous period, anhydrous period number of days and the relation kept away between the ratio of penetrating of 11 mouthfuls of wells, draws to work as and keeps awayPenetrate ratio for 40% when, the time that producing well anhydrous period in fracture developing zone recovers the oil is most long, and anhydrous period it is tired recover the oil it is most；Accordingly, it is determined that the slit formation Carbonate Reservoir M optimal ratio of penetrating of keeping away is 40%.
5) well-log information gathered using logger is pointed to the new of slit formation Carbonate Reservoir M fracture developing zonesThe N wells and P wells of brill carry out Well Data Processing with explaining；And evaluation rubric (Fig. 7) and standard based on carbonate rock Water Flooding Layer(table 1), has drawn the particular location that oil reservoir, Water Flooding Layer and water layer are distributed in N wells, P wells.
The evaluation criterion of the Water Flooding Layer of table 1
| Rank | Moisture content (%) | Oil displacement efficiency (%) |
| Weak water logging | <10 | <15 |
| Low water logging | 10-40 | 15-28 |
| Middle water logging | 40-60 | 28-36 |
| Strong water logging | >60 | >36 |
6) N wells and P wells are in slit formation Carbonate Reservoir M fracture developing zones, and this two mouthfuls of wells partly log well by intervalDatum processing result map difference is as shown in Figure 8 and Figure 9.
As shown in figure 8, in N wells part interval Well Data Processing and interpretation results figure, the 1st road be natural gamma, fromRight current potential, calliper log curve, represent the lithologic character on the stratum；2nd road be it is deep, in, shallow resistivity log, portray thisThe electrical property feature on stratum；3rd road is bulk density, neutron porosity and compressional wave time difference log, reflects the physical property on the stratumFeature；4th road is depth of stratum；5th road is the percentage composition of dolomite, limestone and mud stone in the earth formation；6th road is to explainConclusion and perforated zone；The ratio of penetrating is kept away for 100%, more than step 4) determined by 40%, production effect is relatively preferable, day oil-producing3021 barrels, moisture content is only 0.1%.
As shown in figure 9, in P wells part interval Well Data Processing and interpretation results figure, the 1st road be natural gamma, fromRight current potential, calliper log curve, represent the lithologic character on the stratum；2nd road be it is deep, in, shallow resistivity log, portray thisThe electrical property feature on stratum；3rd road is bulk density, neutron porosity and compressional wave time difference log, reflects the physical property on the stratumFeature；4th road is depth of stratum；5th road is the percentage composition of dolomite, limestone, sandstone and mud stone in the earth formation；6th roadIt is to explain conclusion and perforated zone；The ratio of penetrating is kept away for 37%, less than step 4) determined by 40%, production effect is relatively poor,Day 2084 barrels of oil-producing, moisture content is up to 90%.
Contrast slit formation Carbonate Reservoir M fracture developing zone P wells, the perforating scheme of N wells and production effect to understand, keep away and penetrateRatio brings up to 100% from 37%, and moisture content is reduced to 0.1% from 90%, anhydrous to recover the oil 909 days, tires out oil recovery 2.2 millionBucket, reservoir productivity can be discharged to greatest extent and reduce it by illustrating the preparation method of slit formation Carbonate Reservoir perforation of the present inventionMoisture content, and the too early water logging of oil well is avoided, so as to reach the purpose of volume increase.
Above-described embodiment is merely to illustrate the present invention, wherein the structure of each part, connected mode etc. are all to have becomeChange, every equivalents carried out on the basis of technical solution of the present invention and improvement, should not exclude the guarantor in the present inventionProtect outside scope.